Rolling mill



May 21,1929; J. GASSEN 1,714,084

ROLLING MILL Filed Jan. 15, 1925 I5 Sheets-Sheet l u g Q z w Wm J m FINN. d 2 I a, L F a a 5 m a! I 6 lllilll Josef. assen /W Al lornej.

May 21, 1929.

J. GASSEN 1,114Ibs4 I ROLLING MILL Filed Jan. 15;- 1925 S Sheets-Sheet 2 Fig-5 I Jags/ 638 5671.

May 21, 1929. J. GASSEN ROLLING MILL Filed Jan. 15, 1925 3 Sheets-Sheet 3 III/III! Patented May 21, 1929.

' UNITED STATES v 1,714,084 PATENT OFFICE.

JOSEF GASSEN, OF DUSSELDORF-RATH, GERMANY.

ROLLING MILL.

Application filed January 15, 1925, Serial No. 2,470, and in Germany January 15, 1924.

My invention relates to improvements in rolling mills for manufacturing seamless pipes, and more particularly in mills of the type shown and described in my copending 6 application for Patent Ser. No. 505,411 and 535,998 filed October the 4th, 1921, and February the 13th, 1922, respectively, in which pipes or similar hollow bodies are manufactured from solid blanks or blanks having an axial hole previously made therein, by means of two pairs of rolls disposed so as to provide a continuous caliber, one of said pairs of rolls having the function to prepare the formation of the hole and the other one to r complete the same in immediate succession and the pairs of rolls being independent of each other as to their arrangement and oilcumferential velocity. As has been described in my said applications for patent, by thus constructin the mill the rolls are made to roll on the lank without causing an objec tionable strain on the material by sliding.

One of the objects of the improvements is to construct the pairs of rolls so that the object aimed at is attained in a more perfect way, and with this object in view I provide the first pair of rolls which prepare the formation of the hollow of the pipe. and which are described in the said application as being cylindrical in form, with a slightly tapering working surface. I have found that when passing through the first pair of rolls the blank is slightly reduced in cross-section.

In my improved construction the rolls are adapted to this reduction of the blank by having their circumference reduced accordingly in the direction of the movement of the blank.

Another object of the improvements is to construct the rolls' so that the inner wall of the pipe has a smooth surface, and the finishing operation which heretofore was necessary for removing the helical marks produced on the inner wall may be dispensed with. With this object in view I construct the rolls and the mandrel so as to provide thereon a working face having exclusively the function of finishing the inner wall and removing the said helical marks. The said helical mark begins at the point where the cooperation of the conical rolls and themandrel working on the wall of the pipe is finished. For removing the same I construct the rolls and the mandrel so that at this. art the relative distance of the working aces of the rolls and the mandrel 1s alike for a certain length, and that there- .after the mandrel is gradually reduced in diameter. The portion of uniform distance may be produced either by providing a mandrel of ordinary form and rolls of a slightly concave form, or by providing conical rolls and mandrel which is slightly curved outwardly. Preferably the length of the finishmg portion is larger than the distance between two consecutive helical lines.

Another object of the improvements is to provide guide rolls for the blank passing between the working rolls, which guide rolls are disposed angularly of the axis of the mandrel and have a form similar to that of the conical working rolls, so that the' blank rolls thereon at all parts of the rolls. I am aware that heretofore angular guide rolls have been provided. In my improved mill 'the said angular guide rolls having the novel form referred to result in an improved rollmg process. An important feature of my improved rolls resides in that the'strain on the material is avoided during the entire rolling operation, a sliding of the blank relatively to the guide rolls being avoided. 7

Finally myinvention relates to the mounting of the rolls inthe mill. In mills of the type referred to the space between the rolls is not easily accessible, and it is difiicult to remove a blank from the mill if such blank has been blocked between the rolls, or to dismount the rolls. Further, the adjusting of the rolls is diflicult, because the measuring instruments can be inserted only from the end of the mill. In my improved mill the space between the rolls is made accessible b mounting the rolls in frame members which are open at their to and disposing the upper guide for the blan between the said frame members so that it can be readily removed. Further, the working rolls are removably mounted either in slide members provided on stationary frame members, or in-frame members having a sliding support on the base plate.

For the purpose of explaining the invention several examples embodying the same have been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawin j Fig. 1, is a top plan view of the m1ll, certain parts-of the mechanism being omitted in the interests of clarity,

Figs. 2 to 4, are sectional elevations taken respectively on the lines 22, 33 and 4-4 of Fig. 1,

Fig. 5, is a detail view partly in section showing the tapering rolls on an enlarged scale,

Fig. 6, is a detail view showing a pair of rolls and the cooperating mandrel constructed so as to provide a finishing portion providing the pipe with a smooth inner surface,

Fig. 7, is a similar view showing a modification,

Fig. 8, is a sectional elevation showing the guide roll and Fig. 9, is a top plan View of Fig. 8 with the upper guide member removed.

Referring now at first to Figs. 1 to 4 the frame of my improved mill comprises a base 20 and two upright members 21 and 22 slidable thereon transversely of the axis of the mill. For shifting the members 21 and 22 in transverse direction two spindles 23 and 24 are provided, each of which is equipped w1th right and left screw-threads 25 and 26 .engaging in internally screw-threaded bushings 2 7 and 28 fixed to the said upright members. At one of their ends the said spindles are guided in bearing blocks 29 and 30 fixed to the base member 20, and they have bevel gearings 31 and 32 keyed thereto, which are in mesh with bevel gearings 33 and 34 keyed to a shaft 35 mounted in bearings 36 secured to the base member 20. The shaft 35 s adapted to be rotated in one or the otherdirection for shifting the upright frame members in transverse direction. As shown an screw-threaded "spindle 39 carrying a hand wheel 40.

, To permit of independent movement the frame members 20 and 21 are mounted so that they can be rocked about vertical axes. To show what may be done, thesaid members have cylindrical shoes 127 rockingly mounted in cylindrical bores, which shoes are in sliding engagement with the guide ways 128 formed on the base members 26.

On the upright members 21 and 22 driving shafts 41 and 42 and shafts 43, 44, 45 and 46 are mounted, and the said shafts carry bevel gear wheels 47, 48, 49, 50, 51, 52, 53 and 54 respectively. The shafts 43 and 45 carry tapering rolls 55 and 56, and the shafts 44 and 46 carry beveled rolls 57 and 58, the general construction and cooperation of the saidrolls being similar to that of the rolls described in my aforesaid application for patent.

Below the rolls 55 to 58 bevelled guide rolls 60 and 61' are provided which are mounted on a slide 62 verticallyguided in a' guide way 63 forming a part of the base member 20. As shown the said slide is adapted to be set in vertical position by means of a screw threaded spindle 64 adapted to be rotated by means of a worm gearing 65.

Above the rolls 55 to 58 a guide shoe 66 is mounted on a rocker 67 having a fulcrum on brackets 68 ofthe upright member 22. T he said rocker is adapted to be rocked for moving the shoe 66 away from the rolls 55 to 58 by suitable mechanism. To show what may be done a screw-threaded spindle 69 jointed to the rocker engages in an internally screwthreaded bushing 70 rotatably guided in a cylindrical part 71 of the upright member 22 and bearing with a flange 72 on a shoulder formed in said part 71. To the bushing a worm gearing 73 is secured which is engaged by a worm connected with the armature shaft 74 of an electric motor 75.

The novel features of my improved mill have been shown in detail in the following figures. Fig. 5 shows the construction of the rolls 55 and 56 preparing the formation of the hollow of the pipe.

The relative arrangement of the rolls 55, 57 and 56, 58 is the same as has been described in my aforesaid application for patent. However, the rolls 55 and 56, which in the construction shown in the said prior application are cylindrical in form, have slightly tapering working faces, the diameter at a being slightly smaller than the diameter at 11. Since the blank passing between the rolls 55 and 56 is slightly reduced in cross-section, the circumferential velocity of, the pipe at the part acted upon by the end portion a of the roll is smaller than that of the portion acted upon by the portion a of the roll. Therefore, in order to insure exact rolling and to avoid any strain on the material by friction, the circumferential velocity of the rolls 55, 56 is reduced accordingly.

In Figs. 6 and 7 I have shown the construction of the rolls whereby the helical marks produced in mills heretofore constructed is removed. For finishing the inner wall of the pipe, in the construction shown in Fig. 6, a mandrel of ordinary construction is provided, and the rolls 57* and 58 are formed with concave working faces, so that the space between the mandrel 80 and the rolls 57 and 58 is alike on the portion included between the lines bb and b'-b, the reduction of theblank being completed at the line 6-6. The portion of the mandrel and the rolls included between the said lines b-b and the rolls.

In Figs. 8 and 9 I have shown the guide members for the blank, the figures showing a modification of the construction illustrated in Figs. 1-to 4, in which only one of the lower guide members is in the form of a conical roll 61, the other guide member being in the form of ashoe 60'.

The slide 62' is made integral with a brackin the direction of the movement of the blank in the same degree as the said blank.. Thus i anystrain on the metal caused by sliding of parts of the roll is avoided.

The shoe 60' is secured by means of screws 83 to a block 84 secured to the slide 62. Fig. 8-also shows the removable upper guide 66 and the rocker 67.

While in describing the invention reference has been made to particular examples em bodying the same I wish it to be understood that my invention is not limited to the constructions shown in the drawings, and that various changes may be made in the general arrangement of the apparatus and the construction of its parts without departing from the invention. More particularly I wish it to be understood that various features of the invention from the one referred to above.

' may be embodied in mills of a type different Iclaim:

1*. A rolling mill for manufacturing pipes and the like, comprising a set of cooperating conical rolls, and a mandrel, said rolls having their. axes disposed in leverse obliquely inclined planes with relation to each other and with respect to the axis of the mandrel, the space between the working faces of said rolls and mandrel comprising a portion of decreasing width and a portion of even width.

2. A rolling mill for manufacturing pipes and the like, comprising a set of cooperating rolls ta ering in the direction of the blank, a set 0 cooperating conical rolls adjoining said tapering rolls,.said sets of rolls providing a caliber which flares from the middle outwardly and to opposite sides, and a guide roll axially inclined with respect to the pass between. the first named rolls and having its working face made with diameters.

successively varying from end to' end of said roll according to the corresponding diameters of the blank and so that the circumferenand the like, comprisin a set of cooperat-- ing rolls tapering in t c direction of the blank, a set of cooperating conical rolls adjoining said tapering rolls, said sets of rolls providing acaliber which flares from the middle outwardly and to opposite sides, and a conical guide roll rotatable on an inclined axis and having its workiilg face made with diameters varying'according to the corresponding diameters of the; blank and so that the circumferential velocities of the parts of the guide roll is equalto the circumferential velocities of the parts'of the blank engaged thereby.

4. A rolling mill for manufacturing pipes and the like, comprising a set of cooperating of blank shaping rolls forming a pass between which the ank is moved, blank guiding members above and below said pass, and

a single means for adjustably moving one of the rolls and one of the guiding members towards or from the other rolland guiding member.

6. A rolling mill for manufacturing pipes and the like, comprisin a set of cooperating rolls tapering in t e direction of the blank, a set of cooperating conical rolls adjoining 'said tapering rolls, said sets of rolls providing a caliber which flares from the middle outwardly and to opposite sides, two frame members movable in transverse direction and each carrying one of the rolls of.

each set, and means for transversely movmg said-frame members.

7. A rolling mill for manufacturing pipes and the like, com-prising a' set of cooperating rolls tapering, in the direction of the blank, a set of cooperating conical rolls adjoinin said tapering rolls, said sets of rolls provi mg a caliber which flares from the middle outwardly and to opposite sides, two frame members movable in transverse direction and each carrying one of the rolls of each set, and means for transversely moving said frame members and turning the same about vertical axes.

In testimony whereofI hereunto aflix my signature.

J OSEF GASSEN. 

